In what situation is it necessary to use headlights during the day?

Using headlights during the day is necessary when visibility is low or during rainy conditions. In such situations, headlights help increase the visibility of your vehicle to other drivers, making it easier for them to see you, even in daylight. This is particularly important in adverse weather conditions, as rain can create a hazy atmosphere that reduces overall visibility.

In scenarios such as fog or rain, the use of headlights not only helps others see you but can also increase your ability to see the road ahead. Proper use of headlights can prevent accidents by ensuring that your vehicle is prominent to other drivers who might not otherwise notice it amidst reduced visibility.

Driving in bright sunlight typically does not require the use of headlights, and while it might be good practice to have headlights on in certain urban environments for safety reasons, it is not a universal requirement as it is during low visibility conditions.